Specifications

IM 1060-3 / Page 13 of 32
MicroTech® III Controller
The control enclosure houses the major operating electri-
cal controls including the MicroTech® III controller and I/O
expansion module, control transformer, compressor relays
and fan relay. Each component is easily accessed for service
or replacement.
Three unique control choices are offered with the MicroTech
III control system:
■ StandaloneoperationusingaMicroTechIIIcontrollerand
I/O expansion module
■ MicroTechIIIcontrollerwithI/Oexpansionmoduleand
LonWorks® communication module
■ MicroTechIIIcontrollerwithI/Oexpansionmoduleand
BACnet® communication module
Each option features direct quick-connect wiring to all unit-
controlled components for “clean” wiring inside the control
box. Each control circuit board receives power from a 75 VA
transformer.
Figure 12: Control Options
Control Description Application Protocol
The MicroTech III controller is a stand-
alone microprocessor-based control
board conveniently located in the unit
control enclosure for easy accessibil-
ity. The board is designed to provide
thermostat control of a Water Source
Heat Pump using a two-stage wall
thermostat. The unit controller provides
unit-wide control of the WSHP and
controloftherstrefrigerantcircuit.
The I/O Expansion Module is an exten-
sion of the Microtech III controller and
provides control of the second refriger-
ant circuit. External LED status lights
display fault conditions to provide easy
troubleshooting and diagnosis of the
second circuit.
The MicroTech III control system
accepts a plug-in L
onWorks commu-
nication module to provide network
communications and added functional-
ity to easily integrate with an existing
BAS. The communication module can
be factory- or field-installed and is
tested with all logic required to monitor
and control the unit.
The MicroTech III controller accepts
a plug-in BACnet commu nication
module to provide network commu-
nications and added functionality to
easily integrate with an existing BAS.
The communication module can be
factory-oreld-installedandistested
with all logic required to monitor and
control the unit.
Each unit controller is factory programmed, wired, and
tested for complete control of single zone, standalone
operation of your Daikin McQuay Water Source Heat
Pump.
Allows for:
• Controlofsecondrefrigerationcircuit.
Designed to be linked with a centralized building
automation system (BAS) through a
LonWorks com-
munications network for centralized scheduling and
management of multiple heat pumps.
Designed to be linked with a centralized building
automation system (BAS) through a BACnet com-
munications network for centralized scheduling and
management of multiple heat pumps.
Unit-mounted or wall-
mounted thermostat
Wall-mounted thermo-
stat or sensor
LonMark 3.4 certied
BACnet MS/TP
MicroTech III
(Standalone)
Unit Controller
with
I/O Expansion
Module
LonWorks
Communication
Module
BACnet
Communication
Module